Determination of electron radiation dose uncertainty for strontium tetraborate doped with samarium

Abstract

Thermoluminescence dosimetry (TLD) is useful for radiation detection for a wide range of applications with reasonable accuracy since its introduction to the clinical environment in 1954. However, the determination of uncertainty is crucial to obtain accurate measurements. This study intended to evaluate different types of expected classified errors for strontium tetraborate (SrB4O7) doped with Samarium (Sm+3) to obtain accurate electron dose using luminescence characteristics. Higher temperature solid-state reaction was used to prepare the phosphor. TL glow curves examined after irradiation with a 50 Gy single electron dose. The different causes of uncertainty for the dosimetric material under investigation were assessed. The obtained values of uncertainty were multiplied by the coverage factor two in order to get the expanded doubt at a 95% certainty level. The extended uncertainty from the different examined sources does not surpass 0.8546 nC. When SrB4O7: Sm+3 used as a TLD detector for electron beam dosimetry, the expanded uncertainty recommended to be added to the measured dose to attain the precise dose.